EP0866944B1 - Vorrichtung zur kontrolle von flächenmassen - Google Patents
Vorrichtung zur kontrolle von flächenmassen Download PDFInfo
- Publication number
- EP0866944B1 EP0866944B1 EP96946156A EP96946156A EP0866944B1 EP 0866944 B1 EP0866944 B1 EP 0866944B1 EP 96946156 A EP96946156 A EP 96946156A EP 96946156 A EP96946156 A EP 96946156A EP 0866944 B1 EP0866944 B1 EP 0866944B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- sections
- radiation source
- detector arrangement
- under investigation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims abstract description 37
- 230000005855 radiation Effects 0.000 claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000011835 investigation Methods 0.000 claims abstract 6
- 239000012212 insulator Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
- G01B15/025—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness by measuring absorption
Definitions
- the invention relates to a device for controlling Area masses during the production of material webs by means of a radiation source which the material web or the sample is irradiated and the residual radiation is detected the side of the sample opposite the radiation source with the aid of a detector arrangement filled with ionizable gas.
- Such devices are used, for example, for continuous Thickness measurement of cold or hot rolled sheets or foils, or also for the continuous thickness measurement of Paper webs or the like used.
- the thickness measurement takes place punctiform with the help of a radiation source, such as one X-ray or nuclear radiation source with suitable intensity, Radiation type and energy, that of the material web or the Radiation intensity weakened by an ionization chamber is measured.
- a radiation source such as one X-ray or nuclear radiation source with suitable intensity, Radiation type and energy
- Such a device for measuring the thickness of flat profiles is known from DE 31 40 714 A1.
- one or more punctiform Radiation sources arranged, those below the flat profile each assigned a large number of ionization chambers are.
- the radiation sources are designed as point sources and the radiation is hidden in a fan shape, they are ionization chambers each associated with a radiation source aligned with the radiation source.
- the ionization chambers are arranged in a collimator bar with cylindrical Collimator openings is provided with its axis are precisely aligned to the radiation source. So that will however, does not achieve that which reaches each ionization chamber Radiation intensity is the same.
- a similar device is also known from DE 37 07 107 A1 and DE 1812893, wherein here the ionization chambers or the detectors over the surface of the Good to be measured distributed in several rows are. An improvement in the resolution can thus be achieved.
- US-A-4 720 808 shows a method and a device for measuring the mass per unit area, in which below of the material to be measured, several radiation sources are arranged side by side. That from the radiation sources outgoing radiation is on the opposite of the radiation sources Side of the measured material from individual detectors receive. The number of detectors corresponds to the number of Radiation sources.
- FR-A-1 260 805 it can be used as an ionizable gas Argon can be used to fill the ionization chamber is.
- the invention is therefore based on the object of a device to control area masses which avoids the shortcomings of the prior art, and in particular as detailed information as possible about the mass per unit area supplies.
- the invention makes it possible to measure the transverse profile created by material webs so that an immediate Influencing the production process becomes possible. There the radiation source and the measuring chambers during the measuring process no longer need to be moved, the technical effort considerably. In addition, the small distance between the radiation source and the measuring chambers the use of soft radiation.
- the common gas filling prevents changes in sensitivity caused by the filling gas.
- the upper end of the housing 2 forms one with radiation entry windows 9 provided closure plate 10, which with the Housing 2 is connected gastight.
- the radiation entry window 9 are closed in the usual way by a thin metal foil, which is preferably under tension, after is domed at the top.
- the wall electrodes 4 are only connected to the side walls of the housing 2, the lower and upper end edges 13 a space 14 to the floor 7 or to release the locking plate 10. Instead of this Spaces 14 can also have slots or holes in the Wall electrodes 4 are provided. That way ensured that within the housing 2 and thus within the sections 3 same in terms of gas filling physical parameters can be set.
- the detector arrangement 1 allows use of soft beta emitters, so that the possible uses especially for products with a low mass per unit area become.
- a linear one Radiation source 15 arranged in the form of an isotope source.
- any other radiation sources to use the selection of which depends on the type of material to be measured 16 depends on that between the radiation source 15 and the Detector arrangement 1 is to be passed so that the radiation 17 penetrates the material to be measured 16 and ionization in the sections 3 of the gas contained therein. That's the way it is basically also possible to use spotlights, whereby a spotlight would then be assigned to each section 3.
- 15 instead of the isotope source, 15 also technical emitters, such as electron accelerators or X-ray tubes can be used.
- the 3 can be directly under the radiation source 15, a collimator 18 is arranged, the openings 19 are each arranged above a measuring chamber 3. Thereby there is a partial masking of the radiation 17 and thus a clear assignment of the measured values of the measuring chambers 3 to Measured material 16.
- the chamber current caused by the ionizing radiation 17 is with the help of current-voltage converters 20, which with the supports 6 are connected, converted and can then be evaluated in the usual way.
- the number and size of those to be arranged within the housing 2 Measuring chambers 3 is dependent on the required Resolution and the width of the material web to be measured freely selectable.
- FIG. 4 shows a top view of a detector arrangement 1 with round measuring chambers 3 and associated radiation entry windows 9 and FIG. 5 shows a detector arrangement 1 with angular ones Measuring chambers 3 and round radiation entry windows 9.
- FIG. 6 shows a variant of the detector arrangement 1, in which a continuous covering all measuring chambers 3 Radiation entry window 9 is provided, whereby the Manufacturing effort can be reduced.
- FIG. 7 forth Another variant of the detector arrangement 1 is shown in FIG. 7 forth.
- the radiation entry windows 9 have one particularly large rectangular cross-section, so that a high Sensitivity / resolution even with a soft radiation source 15 is reached.
- the measuring chambers 3 can also be offset in two rows be arranged (Fig. 8), with sufficient radiation divergence transverse to the longitudinal extent in this case linear radiation source 15 in connection with a corresponding collimator 18 is sufficient.
- the above-described device for controlling Surface masses are particularly easy to manufacture because they are complex Adjustment or alignment processes are not necessary. Furthermore, they are not applicable any traversing, since the measurement of the Surface mass with resting elements takes place, the determination a thickness profile across the entire width of the material to be measured 16 is possible and thus a direct influence on the Manufacturing process.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
Abstract
Description
- Fig. 1
- eine erfindungsgemäße Detektoranordnung mit linienförmiger Strahlungsquelle;
- Fig. 2
- eine perspektivische Detaildarstellung der Detektoranordnung;
- Fig. 3
- eine Detektoranordnung mit linienförmiger Strahlungsquelle und einem Kollimator;
- Fig. 4
- eine Detektoranordnung mit runden Sektionen und zugehörigen Strahleneintrittsfenstern;
- Fig. 5
- eine Detektoranordnung mit eckigen Sektionen und runden Strahleneintrittfenstern;
- Fig. 6
- eine Reihenanordnung von Sektionen mit einem durchgehenden Strahleneintrittsfenster;
- Fig. 7
- eine Reihenanordnung von Sektionen mit großflächigen Strahleneintrittsfenstern; und
- Fig. 8
- eine zweireihige Anordnung von Sektionen.
- 1
- Detektoranordnung
- 2
- Gehäuse
- 3
- Sektion
- 4
- Wandelektrode
- 5
- Sammelelektrode
- 6
- Stütze
- 7
- Boden
- 8
- Isolator
- 9
- Strahlungseintrittsfenster
- 10
- Verschlußplatte
- 11
- Abpumpstutzen
- 12
- Verschluß
- 13
- Stirnkante
- 14
- Zwischenraum
- 15
- Strahlungsquelle
- 16
- Meßgut
- 17
- Strahlung
- 18
- Kollimator
- 19
- Öffnung
- 20
- Strom-Spannungswandler
- 21
- Gleichspannungsquelle
Claims (23)
- Vorrichtung zur Kontrolle von Flächenmassen während der Produktion von Materialbahnen mittels einer Strahlungsquelle (15), welche die Materialbahn bzw. das Meßgut (16) durchstrahlt und Detektion der Reststrahlung auf der der Strahlungsquelle (15) gegenüberliegenden Seite des Meßgutes (16) mit Hilfe einer mit ionisierbarem Gas gefüllten Detektoranordnung (1), dadurch gekennzeichnet,daß die Detektoranordnung (1) aus einer Mehrzahl von Sektionen (3) besteht, die durch Wandelelektroden (4) begrenzt werden,daß die Sektionen (3) miteinander in Verbindung stehen und gemeinsam evakuierbar und gemeinsam mit ionisierbarem Gas befüllbar sind,daß die Sektionen (3) innerhalb eines gemeinsamen Gehäuses (2) angeordnet sind,daß jeder Sektion ein Strahlungseintrittsfenster (9) zugeordnet ist, unddaß die den Sektionen (3) zugeordnete Strahlungsintensität der Strahlungsquelle (15) eine linienförmige Verteilung aufweist.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen den die Wandelektroden (4) bildenden Wänden der Sektionen (3) und den jeweiligen Sammelelektroden (5) eine Potentialdifferenz besteht.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Sammelelektroden (5) auf elektrisch leitenden Stützen (6) befestigt sind, die über Isolatoren (8) in den Boden (7) der Detektoranordnung (1) eingelassen sind.
- Vorrichtung nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Sektionen (3) nebeneinander angeordnet sind und die gesamte Breite des zu messenden Meßgutes (16) überdecken.
- Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Form der Strahlungseintrittsfenster (9) dem Querschnitt der Sektionen (3) entspricht.
- Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Strahlungseintrittsfenster (9) und die Sektionen (3) rund ausgebildet und nebeneinander angeordnet sind.
- Vorrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß Strahlungseintrittsfenster (9) rund und die zugehörigen Sektionen (3) eckig ausgebildet sind.
- Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Sektionen (3) in wenigstens zwei Reihen versetzt nebeneinander angeordnet sind.
- Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß alle Sektionen (3) mit einem gemeinsamen streifenförmigen Strahlungseintrittsfenster (9) versehen sind.
- Vorrichtung nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß die Strahlungsquelle (15) aus einer Isotopenquelle besteht.
- Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß sich die Strahlungsquelle (15) über alle Sektionen (3) erstreckt.
- Vorrichtung nach Anspruch 10 und 11, dadurch gekennzeichnet, daß der Strahlungsquelle (15) ein Kollimator (18) zugeordnet ist.
- Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß der Kollimator (18) zwischen der Strahlungsquelle (15) und dem Meßgut (16) angeordnet ist.
- Vorrichtung nach Anspruch 12 und 13, dadurch gekennzeichnet, daß der Kollimator (18) der gegenüberliegenden Detektoranordnung (1) angepaßt ist.
- Vorrichtung nach den Ansprüchen 12 bis 14, dadurch gekennzeichnet, daß der Kollimator (18) Öffnungen (19) aufweist, deren Querschnitt geringer ist, als der Querschnitt der Strahleneintrittsfenster (9).
- Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, daß die Wandungen der Öffnungen (19) in Richtung zur Detektoranordnung (1) divergieren.
- Vorrichtung nach den Ansprüchen 1 bis 16, dadurch gekennzeichnet, daß die Strahlungsquelle (15) unmittelbar über dem Meßgut (16) angeordnet ist.
- Vorrichtung nach den Ansprüchen 1 bis 17, dadurch gekennzeichnet, daß die Sammelelektroden (5) jeweils mit Strom-Spannungswandlern (20) verbunden sind.
- Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, daß die von den Strom-Spannungswandlern (20) gelieferten Meßwerte digitalisiert und parallel oder seriell einer Schnittstelle einer Auswertesoftware zugeführt werden.
- Vorrichtung nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß jeder Sektion (3) eine punktförmige Strahlungsquelle zugeordnet ist.
- Vorrichtung nach Anspruch 20, dadurch gekennzeichnet, daß die Strahlungsquellen äquidistant zu den Sektionen (3) angeordnet sind.
- Vorrichtung nach einem der Ansprüche 1 bis 21, dadurch gekennzeichnet, daß als Strahlungsquelle ein weicher Beta-Strahler verwendet wird.
- Vorrichtung nach einem der Ansprüche 1 bis 22, dadurch gekennzeichnet, daß als Strahlungsquelle ein technischer Strahler verwendet wird.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19545340 | 1995-12-05 | ||
| DE19545340A DE19545340C2 (de) | 1995-12-05 | 1995-12-05 | Vorrichtung zur Kontrolle von Flächenmassen |
| PCT/DE1996/002314 WO1997021075A2 (de) | 1995-12-05 | 1996-12-03 | Vorrichtung zur kontrolle von flächenmassen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0866944A2 EP0866944A2 (de) | 1998-09-30 |
| EP0866944B1 true EP0866944B1 (de) | 2001-08-08 |
Family
ID=7779239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96946156A Expired - Lifetime EP0866944B1 (de) | 1995-12-05 | 1996-12-03 | Vorrichtung zur kontrolle von flächenmassen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6204507B1 (de) |
| EP (1) | EP0866944B1 (de) |
| JP (1) | JP2000501188A (de) |
| DE (2) | DE19545340C2 (de) |
| WO (1) | WO1997021075A2 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19731608C1 (de) * | 1997-07-23 | 1998-10-22 | Vacutec Mestechnik Gmbh | Ionisationskammer für radiometrische Meßeinrichtungen |
| DE59808464D1 (de) * | 1997-03-21 | 2003-06-26 | Vacutec Mestechnik Gmbh | Ionisationskammer für radiometrische messeinrichtungen |
| DE19913929A1 (de) * | 1999-03-26 | 2000-09-28 | Voith Sulzer Papiertech Patent | Vorrichtung und Verfahren zum Bestimmen von Eigenschaften einer Materialbahn |
| US7106828B2 (en) * | 2001-11-26 | 2006-09-12 | Agilent Technologies, Inc. | X-ray imaging using pixelated gas detectors |
| DE10214584B4 (de) * | 2002-03-01 | 2004-07-08 | Mahlo Gmbh & Co Kg | Verfahren zur Kompensation des Einflusses physikalisch-chemischer, das Resultat einer Flächengewichtsmessung verfälschender Änderungen des Absorptionsvermögens einer Umgebungsatmosphäre in der Nähe geförderter Materialien |
| DE102007001358B4 (de) * | 2007-01-09 | 2020-12-24 | Fagus-Grecon Greten Gmbh & Co. Kg | Vorrichtung zum Schutz einer Verarbeitungseinrichtung für einen vorzugsweise endlosen, bewegten Materialstrang gegen mechanische Beschädigungen |
| EP4407310A4 (de) * | 2022-08-30 | 2025-02-26 | Contemporary Amperex Technology (Hong Kong) Limited | Elektrodenplattendetektionsvorrichtung |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1260805A (fr) * | 1956-03-23 | 1961-05-12 | Ohmart Corp | Chambre d'ionisation notamment pour systèmes de mesure ou de contrôle |
| US3160753A (en) * | 1959-02-02 | 1964-12-08 | Industrial Nucleonics Corp | Method and means for measuring hardness |
| DE1812893A1 (de) * | 1968-12-05 | 1970-06-18 | Knapsack Ag, 5033 Knapsack | Anordnung zur Dickenmessung von Walzgut, insbesondere von Folien |
| DE3140714A1 (de) * | 1981-10-14 | 1983-04-28 | Paul Ing.(Grad.) Flormann | Vorrichtung zur dickenmessung von flachprofilen |
| DE3327267A1 (de) * | 1983-07-28 | 1985-02-14 | Fuji Electric Co., Ltd., Kawasaki, Kanagawa | Vorrichtung zur messung der wandstaerke eines rohrfoermigen teils |
| JPS60230009A (ja) * | 1984-04-28 | 1985-11-15 | Toshiba Corp | 放射線厚さ計 |
| EP0233389A1 (de) * | 1986-02-12 | 1987-08-26 | Josef W. Repsch | Verfahren zur Messung des Flächeneinheitsgewichts, der Dichte und Dicke eines laufenden Bandes |
| US4720808A (en) * | 1985-05-15 | 1988-01-19 | Josef Repsch | Method and apparatus for measuring sheet products |
| DE3707107A1 (de) * | 1987-03-05 | 1988-09-15 | Flormann Paul | Vorrichtung zur simultanen erfassung des dickenquerprofils und der bandbreite beim warmwalzen von flachprofilen |
| FI83706C (fi) * | 1988-11-03 | 1991-08-12 | Kajaani Electronics | Foerfarande och anordning foer maetning av pappersformation. |
| CN1027021C (zh) * | 1993-03-18 | 1994-12-14 | 清华大学 | 气体电离型高能x.γ辐射成象阵列探测装置 |
-
1995
- 1995-12-05 DE DE19545340A patent/DE19545340C2/de not_active Expired - Fee Related
-
1996
- 1996-12-03 DE DE59607463T patent/DE59607463D1/de not_active Expired - Lifetime
- 1996-12-03 JP JP9520865A patent/JP2000501188A/ja not_active Ceased
- 1996-12-03 US US09/077,754 patent/US6204507B1/en not_active Expired - Fee Related
- 1996-12-03 WO PCT/DE1996/002314 patent/WO1997021075A2/de not_active Ceased
- 1996-12-03 EP EP96946156A patent/EP0866944B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000501188A (ja) | 2000-02-02 |
| WO1997021075A3 (de) | 1997-07-17 |
| EP0866944A2 (de) | 1998-09-30 |
| US6204507B1 (en) | 2001-03-20 |
| DE19545340A1 (de) | 1997-06-12 |
| DE59607463D1 (de) | 2001-09-13 |
| WO1997021075A2 (de) | 1997-06-12 |
| DE19545340C2 (de) | 1998-01-29 |
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